Sounds great! Where exactly was it please?

Walking down a drove with thick brambles and Alder on one side and reed bed on the other, there were several singing species. I could identify Garden Warbler, Sedge Warbler and Reed Warbler but there was something a bit different. My Merlin App identified the named birds as well as Melodious Warbler. I ran the App again about quarter of an hour later and got the same result. There were also a small flock of Linnet that staying unusually close by.